Von Kármán Effect over Cylinder, ANSYS CFX
$120.00 Student Discount
- The problem numerically simulates the Von Kármán effect behind a cylinder using ANSYS CFX software.
- The geometry is designed in a 2.5D model with the Design Modeler software.
- We performed the mesh of the model with ANSYS Meshing software, and the element number equals 77,262.
- Body of Influence option is used to create smaller elements around the cylinder.
- The Transient and Steady form of the solution is performed.
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Description
Description
In this project, the Von Kármán effect behind a cylinder is simulated in steady and unsteady form via ANSYS CFX software.
Von Kármán Vortex Street, is a recurring pattern of whirling vortices in fluid dynamics that is brought on by the process of vortex shedding, which is what causes the fluid’s flow to be unsteadily separated around blunt objects.
The 2.5D geometry of the solution is designed in ANSYS Design Modeler software. The cylinder with the diameter of 0.5m is placed at middle of the domain. The Airflow enters the domain with the velocity of 0.1m/s.
Then the geometry is connected to the ANSYS Meshing software. The elements with a high quality is produced in tetrahedral type. Also, the Body of Influence option is used to create smaller elements around the cylinder to capture the solution parameters more accurately.
Furthermore, 10 layers of inflation in set around the circle which results in overall elements equal to 77,262.
Methodology: Steady and Transient Von Kármán
Two simulations are performed which one is Independent of Time (steady state) and the other one is Transient. In addition, the effects of gravity are active. There is a surface tension coefficient of 0.072N/m between water and air.
The turbulence model is Shear Stress Transport (k-ԑ SST).
The Advection Scheme and Turbulence Numeric is High Resolution. Also the Transient Scheme is set to Second Order Backward Euler.
Results
At the end of the solution process, two-dimensional contours, vectors and streamlines related to velocity, pressure and the Turbulence Kinetic Energy are obtained.
As shown in the figures, the Kármán Vortex Street is formed behind the circle clearly. The periodic behavior of airflow over time is displayed in animations exported from CFD-Post software.
Asymmetrical flow patterns develop around the body and alter the pressure distribution when a single vortex is shed. This means that the body in question may vibrate as a result of the periodic lateral forces produced by the alternate shedding of vortices.
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